Profile Details

Create Project

★★★★★

☆☆☆☆☆

USD 50 /hr

★★★★★

☆☆☆☆☆

Hire Dr. Gustavo B.

United Kingdom

USD 50 /hr

Freelance data analyst | Expert in R, Linux | Research in biodiversity with > 10 years of experience

Profile Summary

My main interests are biogeography, paleoichthyology, taxonomy, systematics and data science. Currently I'm studying the fishes from Cenozoic localities in Northern South America, aiming to understand the history of the peripheral drainages of Northern South America (Magdalena and Maracaibo).

Subject Matter Expertise

• ★ Biostatistics
• ★ Bioinformatics
• ☆ Biology/Life Sciences
• ☆ Earth & Atmospheric Science
• ☆ Biogeography
• ☆ Biodiversity

Services

• Writing
• Research
• Consulting
• Data & AI

Writing Technical Writing

Research Systematic Literature Review

Consulting Scientific and Technical Consulting

Data & AI Statistical Analysis, Data Visualization

Work Experience

Data Analyst (Consultant)

Data Analysis

May 2020 - Present

Education

Biodiversity

Universidade de Sao Paulo Campus da Capital

March 2015 - April 2020

Universidade de São Paulo Museu de Zoologia

2015 - April 2020

BSc. Biology

Universidad Nacional de Colombia

July 2005 - June 2014

Universidad Nacional de Colombia

2005 - 2014

Certifications

• Certification details not provided.

Publications

JOURNAL ARTICLE

Vitor P. Abrahão, Gustavo A. Ballen, Murilo N. L. Pastana, Oscar A. Shibatta(2021). Ontogeny of the brain of Microglanis garavelloi Shibatta and Benine 2005 (Teleostei: Siluriformes: Pseudopimelodidae) . Journal of Morphology. Wiley

Alexander Urbano‐Bonilla, Gustavo A. Ballen(2021). A new species of Chaetostoma (Siluriformes: Loricariidae) from the Orinoco basin with comments on Amazonian species of the genus in Colombia . Journal of Fish Biology. Wiley

Gustavo A Ballen, Mario C C De Pinna(2021). A standardized terminology of spines in the order Siluriformes (Actinopterygii: Ostariophysi) . Zoological Journal of the Linnean Society. Oxford University Press ({OUP})

Peixoto, Luiz AW and Pastana, Murilo NL and Ballen, Gustavo A(2021). New species of glass knifefish genus Eigenmannia (Gymnotiformes: Sternopygidae) with comments on the morphology and function of the enlarged cephalic lateral-line canals of Sternopygidae. Journal of Fish Biology. 98. (1). p. 142--153. Blackwell Publishing Ltd Oxford, UK

Gustavo A. Ballen(2020). New records of the genus Sphyraena (Teleostei: Sphyraenidae) from the Caribbean with comments on dental characters in the genus . Journal of Vertebrate Paleontology. p. e1849246. Informa {UK} Limited

Urbano-Bonilla, Alexander and Ballen, Gustavo A(2020). A new species of Chaetostoma (Siluriformes: Loricariidae) from the Orinoco basin with comments on Amazonian species of the genus in Colombia . Journal of Fish Biology. Blackwell Publishing Ltd Oxford, UK

Ballen, Gustavo A(2020). New Records of the Genus Sphyraena (Teleostei: Sphyraenidae) from the Caribbean with Comments on Dental Characters in the Genus . Journal of Vertebrate Paleontology. p. e1849246. Taylor \& Francis

Ter{\'a}n, Guillermo E and Ballen, Gustavo A and Alonso, Felipe and Aguilera, Gast{\'o}n and Mirande, J Marcos(2019). A new species of Farlowella (Siluriformes: Loricariidae) from the upper Bermejo River, La Plata River basin, northwestern Argentina . Neotropical Ichthyology. 17. (2).

Guillermo E. Terán, Gustavo A. Ballen, Felipe Alonso, Gastón Aguilera, J. Marcos Mirande(2019). A new species of Farlowella (Siluriformes: Loricariidae) from the upper Bermejo River, La Plata River basin, northwestern Argentina . Neotropical Ichthyology. 17. (2). {FapUNIFESP} ({SciELO})

Ballen, Gustavo A and Moreno-Bernal, Jorge W(2019). New Records of the Enigmatic Neotropical Fossil Fish Acregoliath rancii (Teleostei Incertae sedis) from the Middle Miocene Honda Group of Colombia. Ameghiniana. 56. (6). p. 431--440. Asociaci{\'o}n Paleontol{\'o}gica Argentina

Ballen, Gustavo A(2019). Nomenclature of the Sphyraenidae (Teleostei: Carangaria): A synthesis of fossil-and extant-based classification systems. Zootaxa. 4686. (3). p. 397--408.

Gustavo A. Ballen(2018). Supplementary material Article 65677. Tooth row variation in tadpoles of Dendropsophus labialis (Anura: Hylidae: Dendropsophini) and the evolution of oral morphology in the genus . Caldasia. 40. (2). Universidad Nacional de Colombia

Gustavo A. Ballen(2018). Tooth row variation in tadpoles of Dendropsophus labialis (Anura: Hylidae: Dendropsophini) and the evolution of oral morphology in the genus . Caldasia. 40. (2). p. 216--231. Universidad Nacional de Colombia

Urbano-Bonilla, Alexander and Ballen, Gustavo A and Herrera-R, Guido A and Zamudio, Jhon and Herrera-Collazos, Edgar E and DoNascimiento, Carlos and Prada-Pedreros, Sa{\'u}l and Maldonado-Ocampo, Javier A(2018). Fishes of the Cusiana River (Meta River basin, Colombia), with an identification key to its species. ZooKeys. (733). p. 65. Pensoft Publishers

Ballen, Gustavo A(2018). Tooth row variation in tadpoles of Dendropsophus labialis (Anura: Hylidae: Dendropsophini) and the evolution of oral morphology in the genus . Caldasia. 40. (2). p. 216--231. Instituto de Ciencias Naturales, Facultad de Ciencias-Universidad Nacional~…

Ballen, Gustavo A and Pastana, Murilo NL and Peixoto, Luiz AW(2016). A new species of Farlowella (Siluriformes: Loricariidae) of the F. nattereri species-group from the rio Xingu basin, Mato Grosso, Brazil, with comments on Farlowella jauruensis, a poorly-known species from the upper rio Paraguai basin. Neotropical Ichthyology. 14. (3). Sociedade Brasileira de Ictiologia

Ballen, Gustavo A and Urbano-Bonilla, Alexander and Maldonado-Ocampo, Javier A(2016). Description of a new species of the genus Chaetostoma from the Orinoco River drainage with comments on Chaetostoma milesi Fowler, 1941 (Siluriformes: Loricariidae). Zootaxa. 4105. (2). p. 181--197.

Ballen, Gustavo A and Urbano-Bonilla, Alexander and Zamudio, Jhon E(2016). Farlowella mitoupibo, a new species of stick catfish from the upper Guaviare River, Orinoco basin, Colombia (Teleostei: Loricariidae). Ichthyological Exploration of Freshwaters. 27. (4). p. 325--332.

Moreno, F and Hendy, AJW and Quiroz, L and Hoyos, N and Jones, DS and Zapata, V and Zapata, S and Ballen, GA and Cadena, E and C{\'a}rdenas, AL and others(2015). Revised stratigraphy of Neogene strata in the Cocinetas basin, La Guajira, Colombia. Swiss Journal of Palaeontology. 134. (1). p. 5--43. SpringerOpen

Ballen, Gustavo A and Mojica, Jos{\'e} Ivan(2014). A new trans-Andean stick catfish of the genus Farlowella Eigenmann & Eigenmann, 1889 (Siluriformes: Loricariidae) with the first record of the genus for the ŕıo Magdalena Basin in Colombia. Zootaxa.

Ballen, Gustavo A and Vari, Richard P(2012). Review of the Andean armored catfishes of the genus Dolichancistrus Isbrücker (Siluriformes: Loricariidae). Neotropical Ichthyology. 10. (3). p. 499--518.

Ballen, Gustavo A(2011). A new species of Chaetostoma Tschudi (Siluriformes: Loricariidae) from Colombia with a definition of the C. anale species group. Papéis Avulsos de Zoologia. 51. (26). p. 383--398. Museu de Zoologia da Universidade de S{\~a}o Paulo

Mueses-Cisneros, John Jairo and Ball{\'e}n, Gustavo(2007). Un nuevo caso de alerta sobre posible amenaza a una fauna nativa de anfibios en Colombia: Primer reporte de la rana toro (Lithobates catesbeianus) en la Sabana de Bogotá. Revista de la Academia Colombiana de Ciencias. 31. (118). p. 165--166.

Abrah{\~a}o, Vitor P and Ballen, Gustavo A and Pastana, Murilo NL and Shibatta, Oscar A Ontogeny of the brain of Microglanis garavelloi Shibatta and Benine 2005 (Teleostei: Siluriformes: Pseudopimelodidae) . Journal of Morphology. John Wiley \& Sons, Inc. Hoboken, USA

DISSERTATION THESIS

BALLEN, GUSTAVO A(2014). LATE NEOGENE FRESHWATER FOSSIL CATFISHES (ACTINOPTERYGII: SILURIFORMES) FROM THE PENÍNSULA DE LA GUAJIRA, COLOMBIA.